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symphyseal

The tooth plate has a prominent mesial angle, somewhat blunted, from which the labial margin slopes sharply distad, then veers outward, and finally turns distad again to parallel the straight symphyseal edge.

Radiographic examination revealed an irregular radiolucency in the mandible symphyseal region between the right and left premolars.

The oral surface bears three robust tritors: an elongate outer tritor along the labial margin and anterior and posterior tritors near the symphyseal margin.

symphysial

In this view, soft tissues that permitted, and presumably helped to control, these inter-mandibular movements would have occupied the gap between the symphysial surfaces of the dentaries and splenials.

Anteriorly, the symphysial surface is raised above the adjacent bone and is divided into an upper and lower arm (superior and inferior torus), which meet anteriorly and diverge posteriorly.

From the anterior tip of the dentary, the symphysial area extends posteriorly along the dental shelf to the level of tooth four and posteroventrally along the anteroventral margin of the dentary to the level just anterior of tooth four.